Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text instantly — all four update as you type, right in your browser.
SHA hashes use the browser's native Web Crypto API. MD5 is provided for legacy use — it is not secure for passwords or signatures.
Understanding the Hash Generator
A hash function turns any input into a fixed-length string of characters that acts like a digital fingerprint of the data. This tool generates MD5, SHA-1, SHA-256, and SHA-512 hashes from text you paste, which is useful for verifying file integrity, comparing values, generating checksums, and creating cache keys. It is aimed at developers and anyone confirming that two pieces of data match. Hashing runs in your browser, so the text you enter is never uploaded to any server.
How it works
The tool feeds your text, encoded as UTF-8 bytes, into each algorithm. SHA-256 and SHA-512 use the browser's built-in Web Crypto API (crypto.subtle.digest) for fast, standards-compliant hashing; MD5 and SHA-1 are computed with a vetted JavaScript implementation since browsers no longer expose them. The result is shown in lowercase hexadecimal. Hashing is one-way and deterministic: the same input always yields the same digest, but you cannot reverse the digest back to the input. Read the output as a fixed-width fingerprint whose length depends only on the algorithm, not the input size.
Worked example
Hashing the text "hello" produces the SHA-256 digest 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824, a 64-character hex string. Change one letter to "Hello" and the digest changes completely, demonstrating the avalanche effect. The same "hello" gives the much shorter MD5 5d41402abc4b2a76b9719d911017c592 (32 characters) and a 128-character SHA-512. Re-hash "hello" tomorrow and you get the identical SHA-256 value, which is what makes hashes reliable for integrity checks.
Tips & common mistakes
- MD5 and SHA-1 are broken for security; use them only for checksums, never for passwords or signatures.
- Prefer SHA-256 or SHA-512 when integrity or tamper-resistance matters.
- Hashing is not encryption; you cannot recover the original input from a digest.
- For passwords use a slow, salted algorithm like bcrypt or Argon2, not a raw hash.
- Identical inputs always produce identical hashes, so compare digests to detect any change in data.
Related tools
Frequently Asked Questions
What hash algorithms are supported?
MD5, SHA-1, SHA-256, and SHA-512. The SHA hashes are computed with the browser's native Web Crypto API; MD5 uses a small JavaScript library.
Is MD5 secure?
No. MD5 and SHA-1 are considered cryptographically broken and should not be used for passwords or signatures. Use SHA-256 or SHA-512 for security-sensitive work.
Is my text sent to a server?
No. All hashing happens locally in your browser as you type.